13739520 has 80 divisors (see below), whose sum is σ = 43948080. Its totient is φ = 3661824.

The previous prime is 13739513. The next prime is 13739521. The reversal of 13739520 is 2593731.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13739521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6786 + ... + 8574.

It is an arithmetic number, because the mean of its divisors is an integer number (549351).

Almost surely, 2^13739520 is an apocalyptic number.

13739520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13739520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21974040).

13739520 is an abundant number, since it is smaller than the sum of its proper divisors (30208560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13739520 is an equidigital number, since it uses as much as digits as its factorization.

13739520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1815 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 13739520 is about 3706.6858512693. The cubic root of 13739520 is about 239.5101118314.

The spelling of 13739520 in words is "thirteen million, seven hundred thirty-nine thousand, five hundred twenty".